Now this makes sense to me! Now how about your opinion on starting an engine often to keep the oil up on the walls etc. Its gone in a day or so anyway isn't it? I've always been against the idea since start up is when the worst wear takes place so I minimize the startups. Also at 40 cars I'd get nothing else done. Should I just cut back on cars? Rational person would I bet. -----Original Message----- From: don dulmage <big-d@sympatico.ca> To: L-FORWARDLOOK@LISTS.PSU.EDU <L-FORWARDLOOK@LISTS.PSU.EDU> Date: Friday, October 29, 1999 7:12 AM Subject: Re: [FWDLK] engine breakin >I have watched this thread for a bit and would like to completely >dispell one idea. >Cranking the engine to get oil pressure is not a good idea. Virtually >all serious engine wear takes place during starting . That is because >the oil is not present in the pressurized state. The cylinder walls are >relatively dry and all the oil has dripped off of the camshaft. This is >at least twofold worse on a brand new motor as some of the areas have >never had oil to them yet. Cranking the engine over on the starter till >you have oil pressure is the longest method to get oil to the engine and >even then the only oil going anywhere is in the oil galleries provided >of course the oil pump is turning fast enough to pick it up. The NO 1 >cause of camshaft failure in a new engine as any cam manufacturer will >tell you is the engine was cranked for extended periods of time so no >oil was sprayed up off of the crankshaft onto the camshaft and lifters >and the assembly lube cannot carry the load of lubing the cam that long >(long means a minute or so.) If you want to be good to your engine make >sure the timing is right on and there is some fuel in the carb and fire >and run it immediately. The engine should not be allowed to idle for the >first twenty minutes or so. This way it will get oil everywhere within a >few seconds and will stay lubed as the cam and lifters get familiar with >each other. No damage will result. As an engine builder of some 35 years >I would not cover an engine that is starter cranked for oil pressure and >neither would any cam manufacturer. Dispite the fact that it seems the >right idea because it is complicated and time comsuming it is excactly >the worst thing you can to for your engine and more new engines are >damaged that way than any other. I am sorry if this offends some of you >but it is the absolute truth. If you want to go a step further then >preoil you engine before starting either by running the oil pump with a >preoiler shaft with the distributor removed or with a pressurized >preoiler. What you want is the engine running and spraying oil inside as >quickly as is possible. It takes only a few seconds to get oil pressure >and internal spraying when the engine is fired up immediately but it >takes minutes on the starter. Loads are the same but the time is much >longer with the starter cranking deal and there is absolutely no oil >spraying on anything inside the engine.BTW it takes less than 5 minutes >to completely wipe a camshaft lobe. >Don Dulmage >Master Mach , Master Tech ASE >Lars Larson 56 Plymouth wrote: >> >> Dave H has presented most the info, also check your shop or motors manual? >> There is also an association of national engine rebuilders, my rebuild came >> with a detailed breakin procedure and guarantee, maybe U can find one of them >> like at a Jasper or other rebuilder. Cant seem to find my copy, but its 7 >> yrs old so may have disappeared. >> If cranking to build up oil pressure, good to do each spring, dont forget to >> remove the LOW VOLTAGE lead from dist to coil- not the high tension wire. >> L. > |